Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M10/00—Secondary cells; Manufacture thereof
  • H01M10/05—Accumulators with non-aqueous electrolyte
  • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
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  • H01M10/00—Secondary cells; Manufacture thereof
  • H01M10/05—Accumulators with non-aqueous electrolyte
  • H01M10/052—Li-accumulators
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  • H01M10/00—Secondary cells; Manufacture thereof
  • H01M10/05—Accumulators with non-aqueous electrolyte
  • H01M10/052—Li-accumulators
  • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• • H—ELECTRICITY
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  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M10/00—Secondary cells; Manufacture thereof
  • H01M10/05—Accumulators with non-aqueous electrolyte
  • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
  • H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
  • H01M10/0566—Liquid materials
  • H01M10/0567—Liquid materials characterised by the additives
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  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M10/00—Secondary cells; Manufacture thereof
  • H01M10/05—Accumulators with non-aqueous electrolyte
  • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
  • H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
  • H01M10/0566—Liquid materials
  • H01M10/0569—Liquid materials characterised by the solvents
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  • H01M10/00—Secondary cells; Manufacture thereof
  • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
  • H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
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  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M4/00—Electrodes
  • H01M4/02—Electrodes composed of, or comprising, active material
  • H01M4/36—Selection of substances as active materials, active masses, active liquids
  • H01M4/362—Composites
  • H01M4/364—Composites as mixtures
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  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M4/00—Electrodes
  • H01M4/02—Electrodes composed of, or comprising, active material
  • H01M4/36—Selection of substances as active materials, active masses, active liquids
  • H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
  • H01M4/386—Silicon or alloys based on silicon
• • H—ELECTRICITY
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  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M4/00—Electrodes
  • H01M4/02—Electrodes composed of, or comprising, active material
  • H01M4/36—Selection of substances as active materials, active masses, active liquids
  • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
  • H01M4/483—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides for non-aqueous cells
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M4/00—Electrodes
  • H01M4/02—Electrodes composed of, or comprising, active material
  • H01M4/36—Selection of substances as active materials, active masses, active liquids
  • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
  • H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
  • H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M4/00—Electrodes
  • H01M4/02—Electrodes composed of, or comprising, active material
  • H01M4/36—Selection of substances as active materials, active masses, active liquids
  • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
  • H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
  • H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M4/00—Electrodes
  • H01M4/02—Electrodes composed of, or comprising, active material
  • H01M4/36—Selection of substances as active materials, active masses, active liquids
  • H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
  • H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
• • H—ELECTRICITY
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  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M4/00—Electrodes
  • H01M4/02—Electrodes composed of, or comprising, active material
  • H01M4/36—Selection of substances as active materials, active masses, active liquids
  • H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
  • H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
  • H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M4/00—Electrodes
  • H01M4/02—Electrodes composed of, or comprising, active material
  • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
  • H01M2004/027—Negative electrodes
• • H—ELECTRICITY
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  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M4/00—Electrodes
  • H01M4/02—Electrodes composed of, or comprising, active material
  • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
  • H01M2004/028—Positive electrodes
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M2300/00—Electrolytes
  • H01M2300/0017—Non-aqueous electrolytes
  • H01M2300/002—Inorganic electrolyte
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M2300/00—Electrolytes
  • H01M2300/0017—Non-aqueous electrolytes
  • H01M2300/0025—Organic electrolyte
  • H01M2300/0028—Organic electrolyte characterised by the solvent
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M2300/00—Electrolytes
  • H01M2300/0017—Non-aqueous electrolytes
  • H01M2300/0025—Organic electrolyte
  • H01M2300/0028—Organic electrolyte characterised by the solvent
  • H01M2300/0037—Mixture of solvents
  • H01M2300/004—Three solvents
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
  • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
  • Y02E60/10—Energy storage using batteries

Definitions

• the present invention relates to a non-aqueous electrolyte solution and a lithium secondary battery including the same, and more particularly, to a non-aqueous electrolyte solution, which may improve rapid charging performance and resistance characteristics of a secondary battery, and a lithium secondary battery including the same.
• An aspect of the present invention provides a non-aqueous electrolyte solution, which may improve rapid charging performance and resistance characteristics of a lithium secondary battery, and a lithium secondary battery including the same.
• a non-aqueous electrolyte solution which includes an organic solvent containing cyclic carbonate, dimethyl carbonate, and alkyl formate; a lithium salt; and an oligomer represented by Formula 1 as a surfactant.
• a non-aqueous electrolyte solution of the present invention which includes an organic solvent containing cyclic carbonate, dimethyl carbonate, and alkyl formate, a lithium salt, and an oligomer having a specific structure as a surfactant, is used, a lithium secondary battery having excellent rapid charging performance and low initial resistance characteristics may be achieved.
• a non-aqueous electrolyte solution according to the present invention includes (1) an organic solvent containing cyclic carbonate, dimethyl carbonate, and alkyl formate, (2) a lithium salt, and (3) a surfactant. Also, the non-aqueous electrolyte solution of the present invention may further include (4) an additive, if necessary.
• the non-aqueous electrolyte solution of the present invention includes cyclic carbonate, dimethyl carbonate, and alkyl formate, as an organic solvent.
• the cyclic carbonate is an organic solvent which may well dissociate a lithium salt in the electrolyte solution due to high permittivity as a highly viscous organic solvent, wherein, for example, the cyclic carbonate may include at least one selected from the group consisting of ethylene carbonate (EC), propylene carbonate (PC), 1,2-butylene carbonate, 2,3-butylene carbonate, 1,2-pentylene carbonate, 2,3-pentylene carbonate, and vinylene carbonate.
• ethylene carbonate capable of maintaining passivation ability of a stable solid electrolyte interface (SEI) is particularly preferred.
• the cyclic carbonate may be included in an amount of 10 vol % to 30 vol %, for example, 15 vol % to 25 vol % based on a total volume of the organic solvent. If the cyclic carbonate is included in an amount of less than 10 vol %, since the SEI is unstable, the passivation ability may not be stably maintained, and, if the cyclic carbonate is included in an amount of greater than 30 vol %, viscosity of the electrolyte solution may increase.
• the dimethyl carbonate and the alkyl formate are components for improving rapid charging performance, wherein, since the dimethyl carbonate and alkyl formate have relatively low viscosity and high permittivity, an effect of improving ionic conductivity and lithium ion mobility of the electrolyte solution may be obtained when the dimethyl carbonate and alkyl formate are used.
• the dimethyl carbonate may be included in an amount of 40 vol % to 85 vol %, for example, 50 vol % to 80 vol % based on the total volume of the organic solvent. If the dimethyl carbonate is included in an amount of less than 40 vol %, the ionic conductivity and lithium ion mobility of the electrolyte solution may be reduced, and, if the dimethyl carbonate is included in an amount of greater than 85 vol %, a side reaction due to reduction decomposition of the dimethyl carbonate may occur.
• the lithium salt may include at least one selected from the group consisting of LiCl, LiBr, LiI, LiBF 4 , LiClO 4 , LiAlO 4 , LiAlCl 4 , LiPF 6 , LiSbF 6 , LiAsF 6 , LiB 10 Cl 10 , LiBOB (LiB(C 2 O 4 ) 2 ), LiCF 3 SO 3 , LiTFSI (LiN(SO 2 CF 3 ) 2 ), LiFSI (LiN(SO 2 F) 2 ), LiCH 3 SO 3 , LiCF 3 CO 2 , LiCH 3 CO 2 , and LiBETI (LiN(SO 2 CF 2 CF 3 ) 2 ).
• R g , R h , R i , and R j are each independently a fluorine element or an alkyl group having 1 to 3 carbon atoms which is substituted or unsubstituted with fluorine, and preferably are each independently a fluorine element or a fluorine-substituted alkyl group having 1 to 3 carbon atoms.
• o is an integer of 1 to 3
• p and q are the numbers of repeating units, wherein p is an integer of 1 to 10, and q is an integer of 1 to 15.
• the electrolyte solution according to the present invention may further include additives.
• the sulfate-based compound may include ethylene sulfate (Esa), trimethylene sulfate (TMS), or methyl trimethylene sulfate (MTMS).
• Esa ethylene sulfate
• TMS trimethylene sulfate
• MTMS methyl trimethylene sulfate
• the lithium secondary battery according to the present invention includes a positive electrode, a negative electrode, a separator disposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte solution, and, in this case, the non-aqueous electrolyte solution is the non-aqueous electrolyte solution according to the present invention. Since the non-aqueous electrolyte solution has been described above, a description thereof will be omitted and other components will be described below.
• the positive electrode according to the present invention may include a positive electrode active material layer including a positive electrode active material, and, if necessary, the positive electrode active material layer may further include a conductive agent and/or a binder.
• the positive electrode active material is a compound capable of reversibly intercalating and deintercalating lithium, wherein the positive electrode active material may specifically include a lithium composite metal oxide including lithium and at least one transition metal such as cobalt, manganese, nickel, or aluminum.
• M 1 is a doping element substituted for transition metal sites and may include at least one element selected from the group consisting of tungsten (W), copper (Cu), iron (Fe), vanadium (V), chromium (Cr), titanium (Ti), zirconium (Zr), zinc (Zn), aluminum (Al), indium (In), tantalum (Ta), yttrium (Y), lanthanum (La), strontium (Sr), gallium (Ga), scandium (Sc), gadolinium (Gd), samarium (Sm), calcium (Ca), cerium (Ce), niobium (Nb), magnesium (Mg), boron (B), and molybdenum (Mo).
• x represents an atomic ratio of lithium to total transition metals in the lithium nickel cobalt manganese-based oxide, wherein x may be in a range of 0.8 to 1.2, for example, 1 to 1.2.
• y represents an atomic ratio of nickel among the transition metals in the lithium nickel cobalt manganese-based oxide, wherein y is in a range of 0.7 or more to less than 1, preferably 0.75 to less than 1, and more preferably 0.75 to 0.98. Since higher capacity may be achieved as an amount of the nickel among the transition metals is increased, that the atomic ratio of the nickel is 0.7 or more is more advantageous for achieving high capacity.
• w represents an atomic ratio of manganese among the transition metals in the lithium nickel cobalt manganese-based oxide, wherein w is in a range of greater than 0 to less than 0.3, preferably 0.01 or more to less than 0.3, and more preferably 0.01 or more to less than 0.25.
• v represents an atomic ratio of the doping element M 1 doped into the transition metal sites in the lithium nickel cobalt manganese-based oxide, wherein v may be in a range of 0 to 0.2, for example, 0 to 0.1.
• the doping element M 1 is added, there is an effect of improving structural stability of the lithium nickel cobalt manganese-based oxide, but, since capacity may be reduced when the amount of the doping element is increased, it is desirable that the doping element is included at an atomic ratio of 0.2 or less.
• lithium nickel cobalt manganese-based oxide may be LiNi 0.8 Co 0.1 Mn 0.1 O 2 and the like, but the lithium nickel cobalt manganese-based oxide is not limited thereto.
• the positive electrode active material may be included in an amount of 80 wt % to 98 wt %, for example, 85 wt % to 98 wt % based on a total weight of the positive electrode active material layer. When the positive electrode active material is included in an amount within the above range, excellent capacity characteristics may be exhibited.
• the conductive agent may be graphite such as natural graphite or artificial graphite; carbon based materials such as carbon black, acetylene black, Ketjen black, channel black, furnace black, lamp black, thermal black, and carbon fibers; powder or fibers of metal such as copper, nickel, aluminum, and silver; conductive whiskers such as zinc oxide whiskers and potassium titanate whiskers; conductive metal oxides such as titanium oxide; or conductive polymers such as polyphenylene derivatives, and any one thereof or a mixture of two or more thereof may be used.
• graphite such as natural graphite or artificial graphite
• carbon based materials such as carbon black, acetylene black, Ketjen black, channel black, furnace black, lamp black, thermal black, and carbon fibers
• powder or fibers of metal such as copper, nickel, aluminum, and silver
• conductive whiskers such as zinc oxide whiskers and potassium titanate whiskers
• conductive metal oxides such as titanium oxide
• conductive polymers such as polyphenylene derivatives,
• the conductive agent may be included in an amount of 0.1 wt % to 10 wt %, for example, 0.1 wt % to 5 wt % based on the total weight of the positive electrode active material layer.
• the binder may be polyvinylidene fluoride (PVDF), polyvinylidene fluoride-hexafluoropropylene copolymer (PVDF-co-HFP), polyvinyl alcohol, polyacrylonitrile, carboxymethyl cellulose (CMC), starch, hydroxypropyl cellulose, regenerated cellulose, polyvinylpyrrolidone, polytetrafluoroethylene, polyethylene, polypropylene, an ethylene-propylene-diene polymer (EPDM), a sulfonated EPDM, a styrene-butadiene rubber (SBR), a fluorine rubber, or various copolymers thereof, and any one thereof or a mixture of two or more thereof may be used.
• the binder may be included in an amount of 0.1 wt % to 15 wt %, for example, 0.1 wt % to 10 wt % based on the total weight of the positive electrode active material layer.
• the positive electrode of the present invention as described above may be prepared by a method of preparing a positive electrode which is known in the art.
• the positive electrode may be prepared by a method in which a positive electrode collector is coated with a positive electrode slurry, which is prepared by dissolving or dispersing the positive electrode active material, the binder, and/or the conductive agent in a solvent, dried, and then rolled, or a method in which the positive electrode slurry is cast on a separate support, and a film separated from the support is then laminated on the positive electrode collector.
• the positive electrode collector is not particularly limited as long as it has conductivity without causing adverse chemical changes in the battery, and, for example, stainless steel, aluminum, nickel, titanium, fired carbon, or aluminum or stainless steel that is surface-treated with one of carbon, nickel, titanium, silver, or the like may be used. Also, the positive electrode collector may typically have a thickness of 3 ⁇ m to 500 ⁇ m, and microscopic irregularities may be formed on the surface of the collector to improve the adhesion of the positive electrode material.
• the positive electrode collector for example, may be used in various shapes such as that of a film, a sheet, a foil, a net, a porous body, a foam body, a non-woven fabric body, and the like.
• the solvent may be a solvent normally used in the art, and may include dimethyl sulfoxide (DMSO), isopropyl alcohol, N-methylpyrrolidone (NMP), acetone, or water, and any one thereof or a mixture of two or more thereof may be used.
• An amount of the solvent used may be sufficient if the positive electrode material mixture may be adjusted to have an appropriate viscosity in consideration of a coating thickness of the positive electrode material mixture, manufacturing yield, and workability, and is not particularly limited.
• the negative electrode according to the present invention includes a negative electrode active material layer including a negative electrode active material, and the negative electrode active material layer may further include a conductive agent and/or a binder, if necessary.
• the negative electrode active material may include a carbon-based negative electrode active material, and, as the carbon-based negative electrode active material, various carbon-based negative electrode active materials used in the art, for example, a graphite-based materials such as natural graphite, artificial graphite, and Kish graphite; pyrolytic carbon, mesophase pitch based carbon fiber, meso-carbon microbeads, mesophase pitches, high-temperature sintered carbon such as petroleum or coal tar pitch derived cokes, soft carbon, and hard carbon may be used.
• a shape of the carbon-based negative electrode active material is not particularly limited, and materials of various shapes, such as an irregular shape, planar shape, flaky shape, spherical shape, or fibrous shape, may be used.
• the carbon-based negative electrode active material may include at least one of natural graphite and artificial graphite. More preferably, the carbon-based negative electrode active material may include natural graphite and artificial graphite. In a case in which the natural graphite and the artificial graphite are used together, adhesion with the current collector may be increased to suppress exfoliation of the active material.
• carbon-based negative electrode active material Specific examples of the carbon-based negative electrode active material are the same as described above.
• the silicon-based negative electrode active material may include at least one selected from the group consisting of metallic silicon (Si), silicon oxide (SiO x , where 0 ⁇ x ⁇ 2), silicon carbide (SiC), and a Si—Y alloy (where Y is an element selected from the group consisting of alkali metal, alkaline earth metal, a Group 13 element, a Group 14 element, transition metal, a rare earth element, and a combination thereof, and is not Si).
• the element Y may be selected from the group consisting of Mg, Ca, Sr, barium (Ba), radium (Ra), Sc, Y, Ti, Zr, hafnium (Hf), rutherfordium (Rf), V, Nb, Ta, dubidium (Db), Cr, Mo, W, seaborgium (Sg), technetium (Tc), rhenium (Re), bohrium (Bh), Fe, lead (Pb), ruthenium (Ru), osmium (Os), hassium (Hs), rhodium (Rh), iridium (Ir), palladium (Pd), platinum (Pt), Cu, silver (Ag), gold (Au), Zn, cadmium (Cd), B, Al, Ga, tin (Sn), In, germanium (Ge), phosphorus (P), arsenic (As), antimony (Sb), bismuth (Bi), S, selenium (Se), tellurium (Te
• a mixing ratio of the silicon-based negative electrode active material the carbon-based negative electrode active material may be in a range of 1:99 to 50:50, for example, 5:95 to 30:70, as a weight ratio.
• the mixing ratio of the silicon-based negative electrode active material to the carbon-based negative electrode active material satisfies the above range, since a volume expansion of the silicon-based negative electrode active material is suppressed while capacity characteristics are improved, excellent cycle performance may be secured.
• the binder is a component that assists in the binding between the conductive agent, the active material, and the current collector, wherein the binder is commonly added in an amount of 0.1 wt % to 10 wt % based on the total weight of the negative electrode active material layer.
• the negative electrode may be prepared by a method of preparing a negative electrode which is known in the art.
• the negative electrode may be prepared by a method in which a negative electrode collector is coated with a negative electrode slurry, which is prepared by dissolving or dispersing the negative electrode active material as well as selectively the binder and the conductive agent in a solvent, rolled and dried, or may be prepared by casting the negative electrode slurry on a separate support and then laminating a film separated from the support on the negative electrode collector.
• the negative electrode collector is not particularly limited as long as it has high conductivity without causing adverse chemical changes in the battery, and, for example, copper, stainless steel, aluminum, nickel, titanium, fired carbon, copper or stainless steel that is surface-treated with one of carbon, nickel, titanium, silver, or the like, and an aluminum-cadmium alloy may be used.
• the negative electrode collector may typically have a thickness of 3 ⁇ m to 500 ⁇ m, and, similar to the positive electrode collector, microscopic irregularities may be formed on the surface of the collector to improve the adhesion of the negative electrode active material.
• the negative electrode collector for example, may be used in various shapes such as that of a film, a sheet, a foil, a net, a porous body, a foam body, a non-woven fabric body, and the like.
• the solvent may be a solvent normally used in the art, and may include dimethyl sulfoxide (DMSO), isopropyl alcohol, N-methylpyrrolidone (NMP), acetone, or water, and any one thereof or a mixture of two or more thereof may be used.
• An amount of the solvent used may be sufficient if the negative electrode slurry may be adjusted to have an appropriate viscosity in consideration of a coating thickness of the negative electrode material mixture, manufacturing yield, and workability, and is not particularly limited.
• Ionic conductivities were respectively measured at 25° C., 0° C., and ⁇ 10° C. using a Seven Excellence 5700 instrument by METTLER TOLEDO. Specifically, each of the non-aqueous electrolyte solutions prepared by Examples 1 to 4 and Comparative Examples 1 to 4 was filled in a bath so that a probe for measuring ionic conductivity was immersed in the bath, and the ionic conductivity was then measured through the immersed probe. The measured ionic conductivity values are presented in Table 4 below.

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• 2019
  • 2019-09-03 KR KR1020190108783A patent/KR102777174B1/ko active Active
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